Synovial bursa is a type of small fluid-filled sac found in the joints, tendons and muscles. The function of this bursa is to help in reducing friction between adjacent tissues during movement. There are a few synonyms for this term, such as "musculotendinous bursa", "tendinous bursa", and "fibrous bursa". These synonyms reflect the different locations where the bursa can be found and the different tissues it can be associated with. Regardless of the term used, the synovial bursa plays an important role in maintaining proper joint mechanics and preventing unnecessary wear and tear on the tissues involved in movement.